Dio client for /api/quarantine — flag a track with a reason + optional
notes, unflag by track id. Mirrors the server's user-scoped quarantine
endpoints (separate from /admin/quarantine).
Used by the track-actions menu's Hide/Unhide action in the next slice
of commits.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
